SN74LVC574A-Q1
www.ti.com ............................................................................................................................................... SCAS715B–SEPTEMBER 2003–REVISED APRIL 2008
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOP
WITH 3-STATE OUTPUTS
1
FEATURES
DW OR PW PACKAGE
•
Qualified for Automotive Applications
(TOP VIEW)
•
ESD Protection Exceeds 2000 V Per
MIL-STD-883, Method 3015; Exceeds 200 V
Using Machine Model (C = 200 pF, R = 0)
OE
1D
V
CC
1
2
3
4
5
6
7
8
9
10
20
19
1Q
2D
3D
4D
5D
18 2Q
17 3Q
•
•
•
•
Operates From 2 V to 3.6 V
Inputs Accept Voltages to 5.5 V
Max tpd of 7 ns at 3.3 V
16
15
14
13
12
11
4Q
5Q
6Q
7Q
8Q
CLK
Typical VOLP (Output Ground Bounce) < 0.8 V
at VCC = 3.3 V, TA = 25°C
6D
7D
8D
GND
•
•
•
Typical VOHV (Output VOH Undershoot) > 2 V at
VCC = 3.3 V, TA = 25°C
Supports Mixed-Mode Signal Operation on All
Ports (5-V Input/Output Voltage With 3.3-V VCC
)
Ioff Supports Partial-Power-Down Mode
Operation
DESCRIPTION/ORDERING INFORMATION
The SN74LVC574A octal edge-triggered D-type flip-flop is designed for 2.7-V to 3.6-V VCC operation.
This device features 3-state outputs designed specifically for driving highly capacitive or relatively low-impedance
loads. It is particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working
registers.
On the positive transition of the clock (CLK) input, the Q outputs are set to the logic levels at the data (D) inputs.
A buffered output-enable (OE) input can be used to place the eight outputs in either a normal logic state (high or
low logic levels) or the high-impedance state. In the high-impedance state, the outputs neither load nor drive the
bus lines significantly. The high-impedance state and increased drive provide the capability to drive bus lines
without interface or pullup components.
OE does not affect the internal operations of the flip-flops. Old data can be retained or new data can be entered
while the outputs are in the high-impedance state.
This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.
To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of thIs device as a translator in
a mixed 3.3-V/5-V system environment.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Copyright © 2003–2008, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.